Every night Moon seems to be a different
shape than it was the night before. These apparent shapes are
called "phases". Moon goes through the whole series of changes
each lunar month (approximately 28 days). This activity is to
demonstrate why we see the changing phases of Moon.

1. Stand with your back to Sun. Hold a ball in front of you, high
enough so that it is not in your shadow. Look carefully to see
how much, if any, of the shaded side of the ball you can see.

2. For phase one on the chart below, darken the part of the circle to
show the amount of the shaded side of the ball you saw. Write the
name for this phase in the blank.

3. Standing in the position of the previous phase, turn half left (45
degrees) as shown for the next phase. Record the data as before.